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The slip surface in the D Zone of the Barton Clay

Record type: Article

The most dominant of the preferred bedding plane surfaces of shearing in the Eocene Barton Clay coastal cliffs of the Hampshire Basin is that near the base of the D Zone. This is utilized as the basal surface of compound landslides virtually throughout its 2.3 km outcrop from near the cliff top to beach level, an elevation change of nearly 30 m. The shear zone is located along a thin seam of dark chocolate brown clay, which has been investigated by X-ray powder diffraction mineralogical analysis, X-ray fluorescence chemical analysis, scanning electron microscope study of the microfabric and ring shear tests. The dark seam is slightly more clay rich and has a slightly lower value of residual shear strength than the ambient D Zone clay. The reason for its preference during landsliding is discussed. The available evidence suggests that although some previous shear displacement by flexural slip during folding may have occurred, the main displacement results from the lateral rebound response to coastal recession, involving a reorientation of any previous clay particle alignment. Lateral rebound initiates progressive failure, which leads to the compound landsliding of the in situ clay slopes.

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Citation

Barton, M.E., Hillier, S and Watson, G.V.R (2006) The slip surface in the D Zone of the Barton Clay Quarterly Journal of Engineering Geology and Hydrogeology, 39, (4), pp. 357-370. (doi:10.1144/1470-9236/06-003).

More information

Published date: 2006
Keywords: clay minerals, landslides, slope stability, stiff clay

Identifiers

Local EPrints ID: 53354
URI: http://eprints.soton.ac.uk/id/eprint/53354
ISSN: 1470-9236
PURE UUID: 5729e594-bc84-4a6d-a3e2-e65b3d84016a
ORCID for G.V.R Watson: ORCID iD orcid.org/0000-0003-3074-5196

Catalogue record

Date deposited: 22 Jul 2008
Last modified: 17 Jul 2017 14:38

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